可变长字符串以及数字与字符串的互转

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//---------------------------------------------------------------------------------------------------------- //使用方法： //先用string类型处理字符串，当要传递参数时(参数为LPCWSTR)，才把string to wstring ,然后再传递wstring.c_str(); //----------------------------------------------------------------------------------------------------------- #include <windows.h> #include <atlbase.h> #include <sstream> #include <string> using namespace std; string Int2Str(int i) { ostringstream os; os << i; return os.str(); }; int Str2Int(string str) { return atoi(str.c_str()); } //------wstring to string string ws2s(wstring& inputws) { LPCWSTR pwszSrc=inputws.c_str(); int nLen = WideCharToMultiByte(CP_ACP, 0, pwszSrc, -1, NULL, 0, NULL, NULL); if (nLen<= 0) return std::string(""); char* pszDst = new char[nLen]; if (NULL == pszDst) return std::string(""); WideCharToMultiByte(CP_ACP, 0, pwszSrc, -1, pszDst, nLen, NULL, NULL); pszDst[nLen -1] = 0; std::string strTemp(pszDst); delete [] pszDst; return strTemp; } //------string to wstring std::wstring s2ws(const string& s) { LPCSTR pszSrc=s.c_str(); int nLen=s.size(); int nSize = MultiByteToWideChar(CP_ACP, 0, (LPCSTR)pszSrc, nLen, 0, 0); if(nSize <= 0) return NULL; WCHAR *pwszDst = new WCHAR[nSize+1]; if( NULL == pwszDst) return NULL; MultiByteToWideChar(CP_ACP, 0,(LPCSTR)pszSrc, nLen, pwszDst, nSize); pwszDst[nSize] = 0; if( pwszDst[0] == 0xFEFF) // skip Oxfeff for(int i = 0; i < nSize; i ++) pwszDst[i] = pwszDst[i+1]; wstring wcharString(pwszDst); delete pwszDst; return wcharString; };